Re: [Xen-ia64-devel] [RFC] grant table API clean up and performancetuning memo

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On Thu, Apr 27, 2006 at 01:01:53PM +0200, Tristan Gingold wrote:
> > > But this doesn't work for transfer.
> >
> > As you mentioned above, pages used for transfer is allocated
> > from the slab.
> > The Linux slab allocater calls constructor/destructor.
> > It's easy to register pages used for socket buffer to xen/ia64 in order
> > to track tlb inserts.
> I think this is too late.
> A page may have been already inserted before calling the constructor.
> I think there is a security issue here.

When a domain registers pseudo physicall address, xen/ia64 un-assigns
a corresponding page, and re-assigns a new page.
Freeing the unassigned page can be deferred.

-- 
yamahata

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